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Expression of Exogenous Antigens in the Mycobacterium bovis BCG Vaccine via Non-genetic Surface Decoration with the Avidin-biotin System
Published on: January 31, 2018
DNA vaccine constructs expressing Mycobacterium tuberculosis-specific genes induce immune responses
S N M Hanif1, R Al-Attiyah, A S Mustafa
1Department of Microbiology, Faculty of Medicine, Kuwait University, Kuwait. dr.shumaila_nida@yahoo.com
Scandinavian Journal of Immunology
|November 3, 2010
Summary
This study developed novel DNA vaccines targeting Mycobacterium tuberculosis genes absent in BCG. These recombinant vaccines successfully induced antigen-specific cellular immune responses in mice, showing promise for tuberculosis prevention and therapy.
Area of Science:
- Immunology
- Vaccinology
- Microbiology
Background:
- Certain Mycobacterium tuberculosis genes (RD1, RD9) are absent in Mycobacterium bovis BCG, a common vaccine strain.
- Developing effective vaccines against tuberculosis remains a global health priority.
Purpose of the Study:
- To clone RD1 and RD9 genes from M. tuberculosis into DNA vaccine vectors.
- To fuse these genes with signal peptides (human interleukin-2 and tissue plasminogen activator) for enhanced expression.
- To evaluate the immunogenicity of these recombinant DNA vaccine constructs in mice.
Main Methods:
- Cloning of RD1 and RD9 genes into pUMVC6 and pUMVC7 plasmid vectors.
- Construction of 10 recombinant DNA vaccine candidates.
- Immunization of BALB/c mice with parent and recombinant plasmids.
- Assessment of spleen cell proliferation in response to M. tuberculosis antigens and purified proteins.
Main Results:
- Specific antigen-induced spleen cell proliferation was observed only in mice immunized with homologous recombinant DNA vaccine constructs.
- Mice immunized with parent plasmids showed no specific immune responses.
- The recombinant DNA vaccines elicited antigen-specific cellular immune responses.
Conclusions:
- Recombinant DNA vaccine constructs expressing M. tuberculosis RD1 and RD9 genes fused with signal peptides can induce antigen-specific cellular immunity.
- These DNA vaccines represent promising candidates for safer preventive and therapeutic applications against tuberculosis.
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